Dogging device



Oct. 10, 1933. F E, MAR-[1N 1,930,014

DOGGING DEVIGE Filed Feb. 15'. 192s s sheets-sheet 1 F 67 eff Oct. 10, 1933. F. E. MARTIN DOGGING DEVICE Filed Feb. 15. 192e 6 Sheets-Sheet 2 WM n M,

btofrnug Oct. 10, 1933. E MAR-11N," I 1,930,014

DOGGING DEVICE Filed Feb. 15. 1926 6 Sheets-Sheet 3 Oct. 10, 1933. F. MARTIN 1,930,014

DOGGING DEVICE Filed Feb. 15. 1926 e sheets-sheet 4 gmantov atto/:neg

ct. 1o, 1933.

F. E. MARTIN 1,930,014

DOGGING DEVICE Filed Feb. 15 1926 6 Sheets-Sheet 5 3M A@ 4/ :Jn/vanto@ 37 'o o` l Oct. 10, 1933. F. E. MARTIN 1,930,014

DOGGING DEVICE Filed Feb. 15. 1926 6 Sheets-Sheet 6 Patented Oct. 10, 1933 DoGGING DEVICE l Frederick E. Martin, erkeley, Calif., assigner to Martin Air Dog Company, San Francisco, Calif., a corporation of California l Application February 15, 1926. Serial No. 88,450

18 Claims.

The invention is directed to an improvement in clogging devices for saw mill carriages, and is more particularly directed to a means for controlling and operating dogs or spuds so that 5 they may be readily adapted for cooperation with logs, backing boards, or portions of logs when" quarter sawing.

One of the essential objects of the present invention is the provision of dogs or spuds and operating mechanism therefor, whereby the dogs may be positioned and operated at will to engage with equal eiectiveness either the upper and lower edges Iof the last or backing board, a round` log, or a portion of a log to be held in particular relation to the knee to permit quarter sawing.-

A further object is the provision of means whereby the upper dog or dogs may be automatically withdrawn within to a position to prevent possible injury to the saw should the latter 20 flop or bend, or if the saw guide should accidentally come into the normal path of the dogs.

Another object is to so mount the dogs that they will be more or less resiliently cushioned to permit theirryielding under accidentalcontact of a log therewith in placing the log on the knee, with the result that the dogs are protected against possible injury from this source.

The invention generally stated therefore comprises upper and lower dogs mounted for movement vertically and transversely of the knee and capable of being controlled at the will of the operator in both vertical and transverse movew ments, whereby the dogs maybe projected to that distance beyond the face of the knee desirable to grip or cooperate with the upper and lower edges of a backing board, or projected that distance beyond the knee desired Ywhen the dogs are to cooperate with a log or with a portion of the log to be particularly held in relation to the knee for quarter sawing. Y

The invention is illustrated in the accompanying drawings, in which:

Fig. 1 is a perspective View showing the irnproved dogging apparatus connected with a knee.

Fig. 2 is a side elevation of the same.

Fig. 3 is a perspective View of the dogging apparatus disconnected from the knee, the setting cylinder being omitted.

Fig. 4 is a rear elevation of the knee and'connected mechanism.

Fig. 5 is a view in side elevation showing the parts in position to dog the backing board.

Fig. 6 is an elevation of the parts in the positions for dogging a log as shown in full lines and for dogging a log held for quarter sawing as shown in dotted lines. l

Fig. 7 is a section on line 7 7 of Fig. 2.

Fig. 8 is a section on line 8-8 of Fig. 6, the upper dog being omitted to permit clearer illustration of the lower dog and connected parts.

Fig. 9 is a section on line 9-9 of Fig. 5.

Fig. 10 is a View in elevation, partly in section, showing the means for cushioning and tensioning the upper dog as it is Withdrawn to inoperative position.

Fig. 11 is a perspective View of the dog carrying bar.

slide.

Fig. 13 is a view in elevation, partly in section, showing a modified means for cushioning the dog. Y

In the drawings, l indicates a knee provided with a rack guide 2, in which slides a rack 3 mounted in guides in a head block 4, and cooperating with a pinion forming part of the usual set works. Angle levers 5 and 6, hereinafter termed shifting levers, are fulcrumed at 7 and 8 on shafts extending laterally from the upper and lower portions of the knee, the free terminals of similar arms of each of these levers being pivotally connected at 9 and 10 respectively to an arm 11 of an angle lever 12, hereinafter termed the operating lever. rlhe remaining arm 13 of which operating lever, is connected to the piston rod 14 of a piston l5 operating in a setting cylinder 16 pivotally connected at its lower end at 17 tothe longitudinal leg 1.8 of t1 e knee. The piston 15 is pressure operated and controlled through a valve indicated diagrammatically at 19, whereby pressure may be admitted to the cylinder above or below the piston at will through pipes 20, 21, in accordance with the position of the valve, the valve of course having the usual exhaust 22 which may be connected tol either of the pipes 20 or 21 to permit desired operation of the piston.

The remaining arms of the setting levers 5 and 6 are connected to studs 23, 24:,v projecting laterally from a setting bar 25 which extends in vertical parallelism with and closely adjacent the side of the knee and is provided at its upper end with an angle housing 26 having a vertical portion secured to the bar, and a horizontal portion extending laterally beyond the bar and including upper and lower spaced plates 2'7, 28. Offset from the setting bar 25, the plates 27, 28, of the angle housing are formed with an elongated slot 29 cX- tending in parallelism with the setting bar and slidably receiving a dog carrying bar 30 .which ex-Y Fig. l2 is a perspective view of the'tensioning l 70.

tends through the angle housing in spaced parallelism to the setting bar 25. The dog carrying bar extends below the setting bar, that is, to a point below the operative face of the knee and is provided at its lower end with a dog or spud 3l of appropriate form, preferably however, having its point 32 upturned. This dog or spud, which will be hereinafter termed the lower dog, extends a suflicient distance forwardly of the carrying bar so that its point is at all times beyond the vertical plane of the front face of the knee, the normal or inoperative position of the dog being below the horizontal plant of the head block. An upper dog 33 here shown as of two-prong form, though obviously of any desired form, is slidably mounted upon the dog being secured to a slide 34, ar-

ranged to embrace the bar 30 and open at its forward edge, such open forward edge being closed by a iiller block 36. Both upper and lower` dogs are operated from a normal or inoperative position to an operative or engaging position through the medium of an operating pressure receiving cylinder 37, the upper dog being moved longitudinally of the dog carrying bar and the lower dog moved through bodily operation of such dog carrying bar, as will later appear. The lower end of the dog carrying bar is provided with a spacing block 38 channeled at 39 to slidably receive the lower end of the setting bar 25, to perrnediately above the lower dog with a bracket 40,4

the free termina-l of which bracket iixedly secured to bar 30 as shown, is slidably mounted upon al rod 41 depending from the cylindervB'Z, a spring 42 bearing vbetween the cylinder and bracket, and an adjusting nut 43 on the rod servingto control the tension of the spring. The opening 1n the bracket 40 to receive the rod 4l is of tapered form, as shown to permit necessary play of the parts. As the upper end of the dog carrying bar is, as will later appear, caused to move longitudinally, it is apparent that the spacing block 38 should have a pivotal play with relation to the dog carry-- ing bar, and this is provided by forming the spacing block with a shaft extension 44, which passes through the dog carrying bar and is provided with means 45 to prevent disconnection. The upper end of the dog carrying bar extends through the slot29 in the angle housing 26 carried by the upper end of the setting bar 25, andinclined at 50, so that as the upper dog is eievated the guide block 48 will ride on the surrace 50 of the block 49 and move the dog inwardly relative to the knee, that is, to a position where the points of the dog are inwardly of the faceo-f vthe knee, as clearly shown in dottedlines in Fig.

2. In this movement of the dog, there is of course a corresponding movement oi the upper end of the dog carrying bar 30 and this movement is cushioned and tensioned through the Amedium of a slide 51 mounted in the angle housing 26 between the plates 27 and 28 and recessed on one edge at 52 to receive the dog carrying bar. The slide extends longitudinally of the housing, and beyond the upper plate is formed with an upturned ear 53 to align with a corresponding ear 54 formed on the lower plate 28 of the housing. A cylinder 55 is carried by the ear 54 and the piston 56 therein is connected through the medium kof its rod 57 with the ear 53 of the slide 5l. Thus with pressure in the cylinder 55, the rearward movement of the slide and therefore of the dog carrying bar longitudinally of the angle housing is cushioned and tensioned.

The upper dog is reciprocated longitudinally of the dog carrying bar through the medium of a piston 58 arranged in the cylinder 37, the piston rod 59 of which extends through the usual stuffing box at the end oi the cylinder and is connected to a cross head 60 which laterally of the cylinder is slidably mounted upon a guide upright 6l secured to the angle housing and `maintained rigid by a brace 62 rising from said housing. The cross head 50 is connected by a link 63 to the slide frame carrying the upper dog 33. The operating cylinders 37 and 55 are in Communication through a pipe 64, and a valve 65 with an appropriate exhaust 66 and service pi es 67 and 68, leading respectively to the cylinder 37 below the piston 58 and to the cylinder 55 controls the admission o f Iiuid pressure to the cylinder 37 and also controls the fluid pressure to the cylinder 55.

It is to be understood that the dogs are controlled in their operative positions by the relation of the setting bar to the face oi the knee, and that with the piston l5 of' the setting cylinder 16 in its lowermost position, the operating lever 12 will hold the setting levers 5 and 6 in such position asto maintain the setting bar at its inward limit relative to the face of the knee, in whichposition, the dogs, when operative, project suiciently beyond the face of the knee to grip the upper and lower edges of a backing board indicated at 69 in Fig. 5. When pressure is admitted below the piston l5 however, and the latter moved upwardly in the cylinder 16, the operating lever is actuated to elevate the connected arms of the setting levers with the effect to advance the setting bar toward the face of the knee, vthus projecting the dogs farther beyond the face of the knee or in a-position to engage a log 70 or to engage the angularly related edges 7l of a part of a log held in a particular relation to the face of the knee to permit quarter sawing of that log, as illustrated in Fig. 6. These respective operative positions of the dogs will be hereinafter referred to as the minimum and maximum projected positions. In arranging the dogs to permit the delivery of a log against the knee, the valve 65 is operated to admit pressure through the pipe 67 below the piston 58.in the Cylinder 37. This raises the piston and the link 63, moving the upper dog upwardly on the dog carrying bar 30, until at the extreme upper position the inclined guide block 48 cooperates with the inclined surface 50 ofthe block V49 on the angle housing 26. This causes the. upper dog and also the upper end of the dog carrying bar to move inwardly from the surface of the knee until the extreme end or points of the dog occupy a position substantially flush or inwardly of the face of the knee, as indicated in dotted lines in Fig. 2. This movement of the-upper end of the dog carrying bar will swing the lower end of said bar in the opposite direction on the pivot provided by the shaft 44, but this movement is comparatively slight'and is insuflicient to project the lower dog above. the horizontal plane of the head block.. The inward movement ofthe upper end of the dog carrying bar ofV course actuates the slide 51,' and as the exhaust from the cylinder` 37' is, inthe upward movement of the piston 58, being' directed through the cylinder155, there is some pressure in this cylinder 55.to cushion and tensionv this movementY ofthe slide and therefore of the dog'carrying bar.Y Withthe log' against the knee, the valve' 65 is operated to admit pressureV to the cylinder 37 above` the piston 58,Y it being noted that this pressure is admitted through the cylinder 55. Before the piston in cylinderv 37 canY move down, pressure in the lower4 end* of the cylinder' must bei exhausted and while exhausting the pressure is building up in thev upperl end of cylinder 37 and also in cylinder 55.V As theY piston 58 moves downwardly, the dog 33`is'moved longitudinally of the dog carrying bar, and as it rides from beneath the inclined surface 50 of the block 49, the pressure in cylinder 55 operates to restore the dog' carrying bar to its normal vertical position, thus moving the dog forwardly into either its maximum or minimum projected position as has beenV determined by the operation of the piston in the cylinder 16. This downward movement or" the upper dog continues until the backing board or log is. engaged by the dog, whereupon the further movement of the piston is resisted and the subsequent pressure acts to move the cylinder 37 with respect to the piston. This movement of the cylinder being in the upward direction will, through the bracket 40, act to raise the dog carrying bar with the effect to move the lower dog 31 into engagement with the backing board or log.

It is of course to be understood that initially while the log is being sawed, the dogs are projected at their maximum relative to the face of the knee, and as the cut approaches the backing board, it is necessary that the dogs be withdrawn to their minimum position, thereby permitting the gripping of the backing board for the nal cuts, If in gripping a backingboard, it is found that the board is of such height as to preclude the engagement of the upper edge thereof with the upper dog, it is apparent that such dog must engage the face of the board after the'manner of the usual boss dogs of a saw mill carriage. The present structure readily lends itself to this operation, for it is noted that as the upper dogs leave the inclined guide face 50, the forward movement of the upper end of the dog carrying bar will force the upper dog into the surface of the board.

If for any reason the dog should` remain projected beyond the surface of the knee during the handling of a log, serious injury to the dogs will be avoided by impact of the log as the dogs are mounted on a substantially oating support, which is cushioned by the pressure in cylinder 16, so that the dogs may yield against this pressure under log impact to avoid breaking the dogs.

The cushioning and pressure means for the slide 51 controlling the upper end of the dog carrying bar is shown in the preferred form as pneumatically controlled. It is obvious however, that other means may be employed to this end, such for example, as that shown in Fig. 13, wherein the upper plate 27 of the angle housing 26 is provided with an upstanding ear 72, and theslide 51 with an upstanding ear 73 arranged beyond the ear 72. A rod 74 is carried' bythe ear 72 and extends throtrgh the ear 73,. saidrod being terminally provided with an adjusting: nut" 75 between whichand theear 73 is'arranged a springv 76'coiled about the rod 74;- Thusthe movementv of the' slide 50 .iscushioned and tensioned by the spring 76.

It will be noted that the upper dog and lower dog. are` both operated by the pressure means, butthat the lower dog is not operated until the upper dog has been arrested in its operative movement by engagement. with the log or board.. That is to say,Y through a single'control of the pressure means, the upper dog is" vforced down.- wardly untilv it engages the log or board, whereupon the pressure? responsive element operating such upper dog becomes thexed element with respect to the pressuremeans and the lower dog is thereafter, and substantially as a continuous operation, moved into log engagingposition.

What is claimed as new, is: v

1. The combination with a knee of a saw mill carriage, of a dog mounting bodily movable with respect to the face of the knee, said mounting including a dog carrying bar arranged for independent swinging and sliding movement in the mounting, a lower dog fixed' atlone end of said bar, anupper dog slidable on the bar, and cooperating meansv on said dog andv mounting to cause the bar to swing in a direction away from theface of the knee when said upper dog lis moved to its'upper. limit of movement, andi means ing movement of the bar.

2. The combination with a knee of a saw mill carriage', of a dog mounting bodily movable with respect to the face of the knee, said mounting including a dog carrying bar arranged for independent swinging and sliding movement in the mounting, a lower dog fixed at one end of said'A bar, an upper dog slidable onthe bar, and cooperating means on said dog and mounting to.

causeV the bar to` swing'in a direction away from the face of the knee whensaid upper dog is moved to its upper limit of movement, and means carried by the mounting to cushion. saidswinging movement of the bar, said cushioning means serving to tension the bar movement to compel a reverse movement thereof as the upper dog is moved from its upper limit position..

3. The combination with a knee of a saw milll carriage, of a dog mounting bodily movable with respect to the face of theknee, said mounting including a dog carrying `bar arranged for independent swinging and sliding movement in the mounting, a lower dog xed at oneV end of said llf bar, an upperl dog slidable on the bar, cooperating means on said dog and mounting to cause the bar to swing in aV direction away from the face of the knee when said upper dog is movedv to its upper limitVV of movement, means carried by the mounting to cushion said swinging movement of theV bar, iluidy pressure means for op- Y j erating the mounting as a whole, and independentluid pressure means. for operating dog.`

4. The combination with a knee'ofv a saw mill. carriage, of a dog mounting bodily movableto and fromthe face of the knee, said mounting the upper comprising a setting bar Vmounted on the knee,

operating the upper' dog longitudinally of the dog carrying bar, the movement of said dog to its upper limit serving through cooperation of the inclines on the block and dog to swing the dog -carrying bar in the mounting and retract the upper dog relative to the face of the knee.

5. The combination with a kneeof a saw mill carriage, -of a dog mounting having a floating connection with the'knee to permit the mounting as a unit to be moved toward and from the face of the knee, said mounting comprising a setting bar, an angle housing carried by the upper end of said bar, aV dog carrying bar pivotally and slidably mounted with respectto the setting bar, said dog carrying bar extending through the housing, a dog atthe lower end of the dog carrying bar, a second dog slidably mounted on the dog carrying bar, cooperating means on the housingl and second dog to compel a swinging movement of the dog carrying bar when the second dog is in a predetermined position, a

slide movable in the housing and engaging the dog carrying bar, and pressure means to cushion and resist the movementl of the slideV in the swinging operationof the dog carrying bar incident to' the retractive movement, of the second dog. Y

6. The combination with a knee of a saw mill carriage, of a dog mounting having a floating connection Vwith the knee to permit the mounting as a unit to be moved toward and from the face of the knee, said mounting comprising a setting bar, an angle housing carried by the upper end of said bar, a dog carrying bar pivotally and slidably mounted with respect to the setting bar, said dog carrying bar extending through the housing, a dog at the lower end of the dog carrying bar, a second dog slidably mounted on the dog lcarrying bar, cooperating means on the housing and second dog to compel a swinging movement of the dog carrying bar when the secondA dog is in a predetermined position, a slide movable in the housing and engaging the dog carrying bar, and iiuid pressure means to cushion and resist the movement of the slide in the swinging operation of the dog carrying bar incident to the retractive movement of the second dog.

'7. The combination with a knee oa sawr mill carriage, of a dog mounting therefor bodily movable with respect to the knee and including a setting bar to be connected to the knee, an

angle housing carried by the upper end of saidv setting bar, a dog carrying bar forming part of the mounting and capable of independent sliding and swinging movement in the mounting, a lower dog carried by the lower end of said dog carrying bar, an upper dog slidable longitudinally of the dog carrying bar, and fluid pressure means adapted to initially operate the upper dog to an engagingposition, and thereafter actuate the dog carrying bar in its sliding connection in the mounting to move the lower dog to an engaging position.

8. The combination with a knee of Va saw mill carriage, of a dog mounting therefor bodily movable with respect to the knee and including a .setting bar to be connected to the knee, an angle housing carried by the upper end of said setting bar, a dog carrying bar forming part of the mounting and capable of independent sliding and swinging movement in the mounting, a lower dog carried by the lower end of saidv dog carrying bar, an upper dog slidable longitudinally of the dog carrying bar, a cylinder connected to the dog carrying bar, a piston within said cylinder connected to the upper dog, and means for controlling fluid pressure admission to the cylinder, whereby the upper dog is initially operated to the point of engagement through movement of the piston and thereafter the dog carrying bar is operated to set the lower dog througlimovement of the cylinder.r

9. The combination with a knee of a saw mill carriage, of a' dog mounting therefor bodily movable with respect to the knee andY including a setting bar to be connected to the knee, an angle Vhousing carried by. the'upper end of said setting bar, a dog carrying bar forming part of the mounting and capable of independent slid-y ing and swinging movement rin the mounting, a lower dog carried by the lower end of said dog carrying bar, an upper dog slidable longitudinally of the dog carrying bar, a cylinderv connected to the dog carrying bar, a piston within said cylinder connected to the upper dog, means for controlling fluid pressure admission to the cylinder, whereby the upper dog is initially operated to the point of engagement through movement of the piston and -thereafter'the dog carrying bar is operated to set the lower dog through movement of the cylinder, and means to cushion the movement of the dog carrying bar in the return of the dogs to normal or inoperative positions.

10. The combination with a knee of a saw mill` carriage, of a dog mounting movable with respect to the knee to position thedogs for maximum or minimum projection beyond the face of the knee, said dog mounting including a dog Ycarrying bar mounted for swinging movement in and relative to said mounting, an upper dog longitudinally slidable on the said bar, and means carried by the mounting to cooperate with said upper dog at the upward limit of movement of the latter to move the bar in the mounting and thereby retract the upper dog relative to the surface of the knee.

l1. The combination with a knee of a saw mill carriage, of dogs for holding material to be operated upon by the saw, a support for the dogs movable toward and from the log-engaging surface of the knee, a portion of said support being independently movable toward and from the face of the knee relative to the support as a whole and without regard to the position of said support relative to the log-engaging surface of the knee, oneof said dogs being directly mounted on said relatively movable portion, whereby such dog is movable in the movement of the support as a whole and' in the independent movement of such relatively movable portion.

12. The combination with a knee of a saw mill carriage, of dogs for holding'material to be operated upon by the saw, a support for the dogs movable toward and from the log-engaging surface of the knee, a portion of said support being independently movable toward and from the face of the knee relative to the support as a whole, and Without regard to the position of 'said support relative to the log-engaging surface of thev knee, one of said dogs being slidably mounted on said relatively movable portion, whereby such dog is movable in the movement of the support as a unit, in movement of such relatively. movable portion, and inits own sliding movement.

13. The combination with the knee of a saw mill carriage, ofa dog mounting bodily movable toward and from the face of the knee, a bar forming part of said mounting and independently movable toward and from the face of the knee with respect to the mounting as a Whole, and dogs carried by said mounting, one of said dogs being independently slidable on said bar.

14. The combination with the knee of a saw mill carriage, of a dog mounting including a bar, a lower dog carried thereby, an upper dog slidable thereon, huid pressure means for moving the dog mounting toward and from the face of the knee, and uid pressure means movable with the dog mounting and including a cylinder connected to one of the dogs and a piston connected to the other of said dogs.

15. The combination with the knee of a saw mill carriage, of a dog mounting including a bar, a lower dog carried thereby, an upper dog slidable thereon, fluid pressure means for moving the dog mounting toward and from the face of the knee, fluid pressure means movable with the dog mounting and including a cylinder connected to one of the dogs and a piston connected to the other of said dogs, and cushioning means for absorbing the shock of operation of said last named pressure operated means.

16. rihe combination with the knee of a saw mill carriage, or" a dog mounting including a bar, a lower dog carried thereby, an upper dog slidable thereon, fluid pressure means for moving the dog mounting toward and from the face of the knee, and fluid pressure means movable with the dog mounting and including a piston and a cylinder, one of said parts being connected to the sliding dog and the other or" said parts being connected to the bar, whereby to initially operate the sliding dog and thereafter actuate the bar -to operate the dog carried thereby.

17.'The combination with the knee of a saw mill carriage, of a dog mounting including a bar, fluid pressure means fixed relative to the knee for moving the bar bodily toward and from the face of the knee, an upper dog slidable on the bar, a lower dog carried by the bar, and a fluid pressure means movable with the dog mounting and including a cylinder and a piston, one of said parts being connected to the sliding dog and the other of said parts being connected to the bar, said fluid pressure means acting to initially move the sliding dog until it is arrested in operative position and thereafter move the bar to actuate the remaining dog to an operative position. 1

18. In a saw mill carriage, a knee, a bar mounted for movement toward and from the face of the knee, means for moving said bar, a lower dog movable with the bar and slidable relative thereto, an upper dog movable with the bar and slidable rela-` tive thereto, acylinder movable with the bar and connected to the lower dog, and a piston operative Within the cylinder and connected to the upper dog.

FREDERICK E. MARTIN. 

